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2. Underfloor air distribution - Wikipedia

   en.wikipedia.org/wiki/Underfloor_air_distribution

   UFAD systems use an underfloor supply plenum located between the structural concrete slab and a raised floor system to supply conditioned air to supply outlets (usually floor diffusers), located at or near floor level within the occupied space. Air returns from the room at ceiling level or the maximum allowable height above the occupied zone. [1]

3. Concrete leveling - Wikipedia

   en.wikipedia.org/wiki/Concrete_leveling

   Once the slab is lifted into place, the holes are filled with a color-matching non-shrink grout. Even though the injection pressure is relatively low, compared to Foam Leveling, Stone Slurry Grout Leveling has a high compressive strength of 240 pounds per square inch. [4] This is equal to 34,560 pounds of lifting force per square foot.

4. Gypsum concrete - Wikipedia

   en.wikipedia.org/wiki/Gypsum_concrete

   Gypsum concrete is lightweight and fire-resistant. A 1.5-inch slab of gypsum concrete weighs 13 pounds per square foot versus 18 pounds per square foot for regular concrete. [10] Even though gypsum concrete weighs less, it still has the same compressive strength as regular concrete, based on its application as underlayment or top coat flooring ...

5. Vapor barrier - Wikipedia

   en.wikipedia.org/wiki/Vapor_barrier

   Permeability can be reported in perms, a measure of the rate of transfer of water vapor through a material (1.0 US perm = 1.0 grain/square-foot·hour·inch of mercury ≈ 57 SI perm = 57 ng/s·m 2 ·Pa). American building codes started classifying vapor retarders in the 2007 IRC supplement.

6. Self-leveling concrete - Wikipedia

   en.wikipedia.org/wiki/Self-leveling_concrete

   In the category of self-leveling concrete there are two main groups of materials: underlayments and toppings. An underlayment is installed over an existing subfloor to smooth it out and correct any surface irregularities prior to the installation of all types of floor coverings, including sheet vinyl, vinyl composition tile (VCT), wood, ceramic tile and carpet.

7. Raised floor - Wikipedia

   en.wikipedia.org/wiki/Raised_floor

   This lineup configuration is considered to be the most densely populated in terms of square foot area and, therefore, the largest floor load anticipated for a raised floor system. Considering prorated aisle space, a single equipment cabinet will then occupy an 8-square-foot (0.74 m 2 ) floor area (4 sq ft or 0.37 m 2 for the cabinet and 4 sq ft ...